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Principles I > Medical Gas > Flashcards

Medical Gas Flashcards

0
Q

Name some regulatory agencies that have written guidelines for medical gas systems.

A
  • department of transportation (DOT)
  • national fire prevention association (NFPA)
  • compressed gas association (CGA)
  • american national standards institute (ANSI)
  • US pharmacopeia
  • interstate commerce commission (ICC)
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1
Q

What is medical compressed gas as defined by the Interstate Commerce Commission (ICC)?

A

Any material or mixture having in the container either an absolute pressure exceeding 40 lb/psi at 130 degrees Fahrenheit or any liquid flammable material having a vapor pressure exceeding 40 lb/psi at 100 degrees Fahrenheit

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2
Q

What does the department of transportation do?

A

Agency regulates design, construction, testing, marketing, labeling, filling, storage, handling, maintenance, and transportation of compressed gas cylinders

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3
Q

What material makes up the body of the compressed gas cylinder?

A

The body is usually a steel body with a flat bottom, tapered neck, and about 3/8 inch thick

*aluminum alloy gas containers need to be used during MRIs

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4
Q

Name the different parts of the gas cylinder.

A
  • port: point of exit for the gas
  • valve: made of bronze or brass; attached to the neck of the tank
  • pressure relief valve: vents the cylinder under high pressure
  • conical depression: fits the retaining screw of the yoke
  • stem: moves up to open and down to close
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5
Q

What are the pin positions for oxygen?

A

2 and 5

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6
Q

What are the pin positions for air?

A

1 and 5

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7
Q

What are the pin positions for nitrous oxide?

A

3 and 5

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8
Q

What are the pin positions for carbon dioxide?

A

2 and 6

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9
Q

Describe the pin index safety system (PISS).

A
  • Safety system used for cylinder gas
  • helps prevent gas mix ups
  • there are two holes on each cylinder valve that are positioned to correspond with two pins on the yokes for each gas
  • each gas has unique pin positions that will only fit their specific cylinder valve
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10
Q

Describe the diameter index safety system (DISS).

A
  • safety mechanism for pipeline gas supply

- each pipeline outlet has a different diameter for each gas and its respective hoses

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11
Q

What are the US and international cylinder colors for oxygen?

A

US-green

International-white

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12
Q

What are the cylinder colors for nitrous oxide?

A

Blue

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13
Q

What are the cylinder colors for air?

A

Yellow

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14
Q

What are the cylinder colors for helium?

A

Black

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15
Q

What are the cylinder colors for carbon dioxide?

A

Grey

16
Q

What is an E tank?

A

Most common tank seen and fits anesthesia machine

17
Q

What is the weight of an E tank?

A

14 lbs

18
Q

What are the E tank capacities for air?

A

Max pressure 1900 psig

Max volume 625 L

19
Q

What are the E tank capacities for oxygen?

A

Max pressure 1900 psig

Max volume 660 L

20
Q

What are the E tank capacities of nitrous oxide?

A

Max pressure 745 psig
Max volume 1590 L

*pressure may still read 745 psig down to 250 L so you can’t relay on gauge pressure reading to determine amount of N2O remaining

21
Q

What are some special E tank consideration for N2O?

A
  • nitrous oxide is stored as a liquid at room temperature since its critical temperature is 36.5 degrees C
  • when N2O is removed at >4 L/min, frost lines will form on the outside of tank
22
Q

How do you measure E tank contents of N2O?

A
  • must use the weight of the tank rather than gauge pressure
  • subtract the weight of the empty tank (14 lb) from the total weight
  • convert the remaining weight from lbs to kg (divide by 2.2)
  • convert kg to g (multiply by 1,000)
  • multiply g by 0.55 to get Liters of N2O
  • 1 gram of N2O equals 0.55 L of N2O at 20 degree C*
23
Q

How do you calculate the amount of O2 remaining in the E tank?

A
  • look at the current gauge pressure and determine its percentage of oxygen’s full gauge pressure (1900 psig)
  • find that same percentage of oxygen’s full volume (660 L)
  • determine the remaining time by dividing the remaining Liters by the flow time (L/min) to get the remaining minutes
24
Q

Describe gas container testing.

A
  • tested every five years (unless starred)
  • service pressure is tested to a minimum of 1.6 times the service pressure
  • test date (month and year) is required to be permanently stamped on the cylinder
25
Q

Describe container labeling.

A
  • required on ALL cylinders
  • usually on the shoulder of the cylinder
  • indicates contained gas and triangles indicate hazard class of gas
26
Q

Describe container markings.

A

permanently stamped on the shoulder of the cylinder

  • service pressure- max pressure the cylinder can be filled
  • manufacturer
  • serial number
  • plus sign-indicates the cylinder can be charged up to 10% in excess of service pressure
  • star-indicates testing is only required every 10 years
27
Q

What hazard class does a yellow triangle indicate?

A

Oxidizer gas

28
Q

What hazard class does a red triangle indicate?

A

Flammable gas

29
Q

What hazard class does a green triangle indicate?

A

Non-flammable gas

30
Q

Describe safe cylinder storage.

A
  • cool, clean, dry area
  • nowhere near flame, spark, or heat sources
  • out of direct sunlight
  • store upright in rack
  • if no rack, lie on side (NO FREESTANDING)
31
Q

Describe pipeline gas.

A
  • Hose colors are usually the same as the tank
  • wall terminal uses quick couplers
  • safety- DISS
  • pressures are 50-55 psig from terminal
32
Q

What are some concerns with pipeline gas?

A
  • hose disconnect from hanging ceiling connection of from wall
  • particulate material contaminating the line
  • hoses across the floor can be occluded from heavy equipment
33
Q

Name six hazards of medical gas.

A
  • fires
  • incorrect contents
  • damaged or inoperable valve
  • explosion
  • contaminated contents
  • high pressure release
34
Q

What are 3 sources of medical gas in central supply of facilities?

A
  • bulk supply system (usually liquid)
  • two tank banks (small facilities)
  • tank banks to back up bulk supply

Principles I (18 decks)

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